
<template>

    <el-menu 
      default-active="1-4-1" 
      class="el-menu-vertical-demo" 
      @open="handleOpen" 
      @close="handleClose" 
      :collapse="isCollapse" 
      background-color="#545c64"
      text-color="#fff"
      active-text-color="#ffd04b">

        <h3>{{isCollapse?'后台':'通用后台模板'}}</h3>
        <el-menu-item @click="menuTo(item)" v-for="item in noChildren" :key="item.name" :index="item.name">
          <!--模板语法的引号是特殊了，参照数据库-->
          <i :class="`el-icon-${item.icon}`"></i>
          <span slot="title">{{item.label}}</span>
        </el-menu-item>

        <el-submenu v-for="subItem in Children" :key="subItem.label" :index="subItem.label">

          <template slot="title">
            <i :class="`el-icon-${subItem.icon}`"></i>
            <span slot="title">导航一</span>
          </template>

          <el-menu-item-group v-for="tt in subItem.children" :key="tt.path" :index="tt.path">
            <el-menu-item @click="menuTo(tt)" :index="tt.path">{{tt.label}}</el-menu-item>
          </el-menu-item-group>


        </el-submenu>

    </el-menu>
    </template>

<style lang="less" scoped>
.el-menu-vertical-demo:not(.el-menu--collapse) {
  width: 200px;
  min-height: 400px;
}
.el-menu {
  height: 400vh;
  border: 0px;
  h3{
    color: #fff;
    text-align: center;
    font-size: 16px;
    font-weight: 400;
  }
}
</style>

<script>
  export default {
    data() {
      return {
        menuData:[
          {
            path:'/',
            name:'home',
            label:'首页',
            icon:'s-home',
            url:'Home/Home',
          },
          {
            path:'/mall',
            name:'mall',
            label:'商品管理',
            icon:'video-play',
            url:'Mallmanage/Mallmanage',
          },
          {
            path:'/user',
            name:'user',
            label:'用户管理',
            icon:'user',
            url:'UserManage/UserManage',
          },
          {
            label:'其他',
            icon:'location',
            children:[
              {
                path:'/page1',
                name:'page1',
                label:'页面1',
                icon:'setting',
                url:'Other/PageOne',
              },
              {
                path:'/page2',
                name:'page2',
                label:'页面2',
                icon:'setting',
                url:'Other/PageTow',
              }
            ]
          }
        ]
      };
    },
    methods: {
      handleOpen(key, keyPath) {
        console.log(key, keyPath);
      },
      handleClose(key, keyPath) {
        console.log(key, keyPath);
      },
      menuTo(item){
          // console.log(item);
          if(this.$route.path!==item.path && !(this.$route.path == '/home' && item.path == '/')){
            this.$router.push(item.path)
          }
      }
    },
    computed:{
      noChildren(){
        return this.menuData.filter(item=>!item.children)
      },
      Children(){
        return this.menuData.filter(item=>item.children)
      },
      isCollapse(){
        return this.$store.state.tab.isCollapse;
      }
    }
  }
</script>